MLX90401
Brushless DC Motor Controller
Features and benefits
• 12V to 40V operating range
• BVDSS > 60V
• Forward and reverse control
• Selectable 60° or 120° sensor electrical
phasing
• On-chip “boost” voltage allows use of all
N-channel drivers
• Undervoltage lockout
• On-chip PWM oscillator
• Qualified for automotive applications
• PWM speed control via bottom drivers
Ordering information
Part No.
Temperature Code
Package Code
MLX90401
K (-40°C to 125°C)
DF (300” SOIC24)
Application examples
• Handheld Battery powered applications:
o
Power tools (drills, screwdrivers, etc.)
• Electrical bicycles, wheelchairs, etc.
• Automotive applications:
o
o
Manual HVAC Blowers
Water and other pumps
1 Pin configuration
2 General description
The MLX90401 is a three-phase brushless DC
motor controller, designed to meet the needs of
high volume, low cost motors with 60o or 120°
electrical sensor phasing which do not require
the expensive options needed for servo or other
closed loop applications.
Supply Voltage
VREF Out
1
2
24
23
22
21
20
19
18
17
16
15
14
13
Cap Boost "A"
Gate Top "A"
Hall "A" Input
3
Feedback "A"
Cap Boost "B"
Hall "B" Input
4
The use of CMOS technology offers dense logic
as well as high voltage (60V) driver capabilities.
The use of discrete low cost N-channel power
FETs reduces overall system cost and the
device provides all of the logic necessary to
interface Hall-effect position sensors to N-
channel power FETs. Upper N-channel power
FETs require a gate drive in excess of the
supply voltage V+, and with the device’s on-chip
“boost” voltage, the use of all N-Channel power
FETs is allowed. Control inputs are provided for
motor speed, forward or reverse direction,
disable, and braking. 60° or 120° electrical
sensor phasing can be set externally.
Hall "C" Input
Gate Top "B"
Feedback "B"
5
Fwd/Rev Input
Speed Adjust Input / Disable
Oscillator R/C
6
Cap Boost "C"
Gate Top "C"
7
8
/Brake Input
9
Feedback "C"
Analog Ground
60°/120° Select Input
Power Ground
Gate Bottom "A"
10
11
12
Gate Bottom "B"
Gate Bottom "C"
Figure 1: Pin configuration
The device is offered in a 24 Lead Wide Body
SOIC package (DF).
3901090401
Rev 005
Page 1 of 13
Data sheet
Oct/05